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Single Molecule Detection Using Molecular Motors

a single molecule and molecular motor technology, applied in the direction of specific use bioreactors/fermenters, organic chemistry, after-treatment of biomass, etc., can solve the problems of non-specific binding, requirement, and inconvenient use of dna hybridization assays,

Inactive Publication Date: 2009-02-05
ARIZONA BOARD OF REGENTS A BODY OF THE STATE OF ARIZONA ACTING FOR & ON BEHALF OF ARIZONA STATE UNVERSITY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides methods and compositions for highly sensitive nucleic acid detection, down to the single nucleic acid molecule level. The methods involve detecting a target nucleic acid by using two target-specific nucleic acids that are each bound to an affinity tag. The two tags are then connected together, and a molecular motor is used to detect any movement of the tags. This movement is used to detect the presence of the target nucleic acid in a sample. The technical effect of this invention is that it allows for more accurate and sensitive detection of target nucleic acids."

Problems solved by technology

However they inherited the intrinsic limitation of DNA hybridization assays such as nonspecific binding, hybridization kinetics, and the requirement for a purified sample.

Method used

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  • Single Molecule Detection Using Molecular Motors
  • Single Molecule Detection Using Molecular Motors

Examples

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example 1

[0059]As shown in FIG. 1, one embodiment of the disclosed methods comprises the following steps:[0060]1. As indicated in FIG. 1a, a first affinity tag is attached to the 5′ end of the first target-specific DNA strand. A second affinity tag is attached to the 3′ end of second target-specific DNA strand (FIG. 1a).[0061]2. In FIG. 1b the first and second target-specific nucleic acid strands are hybridized to the target nucleic acid so that the 3′ end of the first target-specific strand is directly adjacent to the 5′ end of the second target-specific strand.[0062]3. In FIG. 1c the first and second target-specific DNA strands are ligated, to generate a double-stranded DNA sequence that contains the first and second affinity tags at each end.[0063]4. In FIG. 1d the double-stranded DNA that contains the affinity tags is then used as a bridge between a molecular motor and the detection probe used to detect the motion generated from the motor via the affinity tags. The first affinity tag att...

example 2

[0065]The following are two examples for detecting multiple target nucleic acids simultaneously:

[0066]Approach 1: Detection probes comprising gold rods of different sizes are used to detect ligated DNAs that are specific to pBR322 and Lambda DNA simultaneously using the following procedures:

1. Gold nanorods of different lengths are prepared because the length determines the wavelength of light scattered from it. The short and long gold rods are prepared to enable them to bind to digoxigenin (DIG) and dinitrophenyl-X (DNP-X), respectively.

2. Two pair of target-specific nucleic acids are prepared that are designed to hybridize specifically with pBR322 and Lambda DNA, respectively.

3. To enable the target-specific nucleic acid pairs to bridge between F1 ATPase and a gold nanorod, one target-specific nucleic acid from each pair is labeled with biotin while the other target-specific nucleic acid is labeled with DIG and DNP-X for pBR322 and Lambda DNA, respectively.

4. LCR is performed with...

examples 3

[0068]Four components of a molecular semaphore device were prepared separately: (1) a DNA bridge made from the target DNA; (2) modified F1-ATPase; (3) nickel-coated coverslips; and (4) coated nanorods. After these components were prepared, they were assembled into the device. Rotation of the nanorod attached to the device was observed if the DNA bridge was present to enable assembly of the device.

1. LCR Procedure to Prepare the DNA Bridge.

[0069]All oligonucleotides were synthesized by Integrated DNA Technologies (IDT), including those with biotin labels. The target DNA used in this example was F1 plasmid DNA (GenBank accession no. J01594). The two probes used were.

5′-CTTGCCGAAGGCATGAAAGTTAAGTG (Probe 1);andTACTGGCCGTATCCTGGAAGTTCCG-3′ (Probe 2).

[0070]These sequences are complimentary to the target in the following order:

CTTGCCGAAGGCATGAAAGTTAAGTGTACTGGCCGTATCCTGGAAGTTCCG.

[0071]The 5′ end of probe 1 contained covalently bound biotin. The 3′ end of the probe 2 contained covalently bou...

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Abstract

The present invention provides methods and compositions for highly sensitive nucleic acid detection, down to the single nucleic acid molecule level. In one aspect, the present invention provides methods for detecting a target nucleic acid comprising: (a) providing first and second target-specific nucleic acids, wherein the first and second target-specific nucleic acids each comprise sequences complementary to the target nucleic acid; wherein the first target specific nucleic acid is bound to a first affinity tag and the second target-specific nucleic acid is bound to a second affinity tag, wherein the first affinity tag is capable of binding to a molecular motor, and wherein the second affinity tag is capable of binding to a detection probe; (b) contacting the first and second target-specific nucleic acids to a sample under conditions whereby the first and second target-specific nucleic acids will hybridize to the target nucleic acid if the target nucleic acid is present in the sample, wherein upon hybridization to the target nucleic acid the first and second target-specific nucleic acids are directly adjacent to each other; (c) ligating the first and second target-specific nucleic acids together; (d) binding the molecular motor t˜ the first affinity tag and the detection probe to the second affinity tag; (e) inducing movement of the molecular motor; and (f) detecting movement of the molecular motor through the detection probe, wherein the movement of the molecular motor serves to detect the target nucleic acid in the sample.

Description

CROSS REFERENCE[0001]This application claims priority to U.S. Provisional Patent Application Ser. No. 60 / 530,547 filed Dec. 17, 2003.STATEMENT OF GOVERNMENT INTEREST[0002]Financial assistance for this project was provided by U.S. Government, DARPA #N66001-03-C-XXXX; thus the United States Government may have certain rights to this invention.BACKGROUND OF THE INVENTION[0003]Various DNA hybridization methods have been developed in attempts to improve the sensitivity of nucleic acid detection techniques (See, for example, Singh-Zochhi et al., 2003; Castro et al., 1995, 1997, 2000). These methods have shown great potential for ultra-sensitive detection of nucleic acid. However they inherited the intrinsic limitation of DNA hybridization assays such as nonspecific binding, hybridization kinetics, and the requirement for a purified sample. Thus, novel methods of sensitive DNA detection are needed.SUMMARY OF THE INVENTION[0004]The present invention provides methods and compositions for hig...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68
CPCC12Q1/6825C12Q1/6834C12Q2565/619C12Q2531/137C12Q2533/107C12Q2565/601C12Q2565/629C12Q2563/125
Inventor HE, LYIANFRASCH, WAYNE
Owner ARIZONA BOARD OF REGENTS A BODY OF THE STATE OF ARIZONA ACTING FOR & ON BEHALF OF ARIZONA STATE UNVERSITY
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